Feeling so lonely

After the break up, I just feel like I'm missing something in life. I feel so lonely when I'm by myself that I feel the need to constantly talk to someone. I message my (very limited) friends almost every day that I think they're just sick of me now. And I can imagine why, I always talk about how sad I am and how he did something that makes me feel like he's happy without me etc. If I can't talk to them, then I would post here, which happens quite often. It's not that they're not willing to talk, it's just that I don't want to keep telling them the same things and have them repeat their replies every time. But I can't help it that everyday I feel the same way and just need to let it out and seek comfort everyday.

I feel so lonely sometimes I just sit in my room and look around and wonder what exactly is so wrong that I feel so empty.